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  <title>The CairoFormat class</title>

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 <h1 class="title">The CairoFormat class</h1>
 

 <div class="partintro"><p class="verinfo">(PECL cairo &gt;= 0.1.0)</p>


  <div class="section" id="cairoformat.intro">
   <h2 class="title">简介</h2>
   <p class="para">
    CairoFormat enums are used to identify the memory format of the image data.
   </p>
  </div>


  <div class="section" id="cairoformat.synopsis">
   <h2 class="title">类摘要</h2>


   <div class="classsynopsis">
    <div class="ooclass"></div>


    <div class="classsynopsisinfo">
     <span class="ooclass">
      <strong class="classname">CairoFormat</strong>
     </span>
     {</div>

    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 常量 */</div>
    <div class="fieldsynopsis">
     <span class="modifier">const</span>
     <span class="type">integer</span>
      <var class="fieldsynopsis_varname"><a href="class.cairoformat.html#cairoformat.constants.argb32"><var class="varname">ARGB32</var></a></var>
     <span class="initializer"> = 0</span>
    ;</div>

    <div class="fieldsynopsis">
     <span class="modifier">const</span>
     <span class="type">integer</span>
      <var class="fieldsynopsis_varname"><a href="class.cairoformat.html#cairoformat.constants.rgb24"><var class="varname">RGB24</var></a></var>
     <span class="initializer"> = 1</span>
    ;</div>

    <div class="fieldsynopsis">
     <span class="modifier">const</span>
     <span class="type">integer</span>
      <var class="fieldsynopsis_varname"><a href="class.cairoformat.html#cairoformat.constants.a8"><var class="varname">A8</var></a></var>
     <span class="initializer"> = 2</span>
    ;</div>

    <div class="fieldsynopsis">
     <span class="modifier">const</span>
     <span class="type">integer</span>
      <var class="fieldsynopsis_varname"><a href="class.cairoformat.html#cairoformat.constants.a1"><var class="varname">A1</var></a></var>
     <span class="initializer"> = 3</span>
    ;</div>

    
    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 方法 */</div>
    <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="modifier">static</span> <span class="type">int</span><span class="methodname"><a href="cairoformat.strideforwidth.html" class="methodname">strideForWidth</a></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$format</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$width</code></span>
   )</div>

   }</div>


  </div>
  

  <div class="section" id="cairoformat.constants">
   <h2 class="title">预定义常量</h2>
   <dl>


    
     <dt id="cairoformat.constants.argb32"><strong><code>CairoFormat::ARGB32</code></strong></dt>

     <dd>

      <p class="para">Each pixel is a 32-bit quantity, with alpha in the upper 8 bits, then red, then green, then blue.
      The 32-bit quantities are stored native-endian.
      Pre-multiplied alpha is used. (That is, 50% transparent red is 0x80800000, not 0x80ff0000.)
      </p>
     </dd>

    

    
     <dt id="cairoformat.constants.rgb24"><strong><code>CairoFormat::RGB24</code></strong></dt>

     <dd>

      <p class="para"> Each pixel is a 32-bit quantity, with the upper 8 bits unused.
      Red, Green, and Blue are stored in the remaining 24 bits in that order.
      </p>
     </dd>

    

    
     <dt id="cairoformat.constants.a8"><strong><code>CairoFormat::A8</code></strong></dt>

     <dd>

      <p class="para">Each pixel is a 8-bit quantity holding an alpha value.</p>
     </dd>

    

    
     <dt id="cairoformat.constants.a1"><strong><code>CairoFormat::A1</code></strong></dt>

     <dd>

      <p class="para">Each pixel is a 1-bit quantity holding an alpha value.
      Pixels are packed together into 32-bit quantities.
      The ordering of the bits matches the endianess of the platform.
      On a big-endian machine, the first pixel is in the uppermost bit,
      on a little-endian machine the first pixel is in the least-significant bit.
      </p>
     </dd>

    

   </dl>

  </div>



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<h2>Table of Contents</h2><ul class="chunklist chunklist_reference"><li><a href="cairoformat.strideforwidth.html">CairoFormat::strideForWidth</a> — Provides an appropiate stride to use</li></ul>
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